/Engine/Source/Runtime/Engine/Classes/Engine/GameViewportClient.h
Notification of network error messages generally not expected to handle the failure here, but provide notification to the user
virtual void PeekNetworkFailureMessages ( [UWorld](API\Runtime\Engine\Engine\UWorld) * InWorld, [UNetDriver](API\Runtime\Engine\Engine\UNetDriver) * NetDriver, enum [ENetworkFailure::Type](API\Runtime\NetCore\Net\Core\Connection\ENetworkFailure__Type) FailureType, const [FString](API\Runtime\Core\Containers\FString) & ErrorString )